package GD::Simple;
=head1 NAME
GD::Simple - Simplified interface to GD library
=head1 SYNOPSIS
For a nice tutorial on using this module, see Gabor Szabo's article at
http://perlmaven.com/drawing-images-using-gd-simple.
use GD::Simple;
# create a new image
$img = GD::Simple->new(400,250);
# draw a red rectangle with blue borders
$img->bgcolor('red');
$img->fgcolor('blue');
$img->rectangle(10,10,50,50);
# draw an empty rectangle with green borders
$img->bgcolor(undef);
$img->fgcolor('green');
$img->rectangle(30,30,100,100);
# move to (80,80) and draw a green line to (100,190)
$img->moveTo(80,80);
$img->lineTo(100,190);
# draw a solid orange ellipse
$img->moveTo(110,100);
$img->bgcolor('orange');
$img->fgcolor('orange');
$img->ellipse(40,40);
# draw a black filled arc
$img->moveTo(150,150);
$img->fgcolor('black');
$img->arc(50,50,0,100,gdNoFill|gdEdged);
# draw a string at (10,180) using the default
# built-in font
$img->moveTo(10,180);
$img->string('This is very simple');
# draw a string at (280,210) using 20 point
# times italic, angled upward 90 degrees
$img->moveTo(280,210);
$img->font('Times:italic');
$img->fontsize(20);
$img->angle(-90);
$img->string('This is very fancy');
# some turtle graphics
$img->moveTo(300,100);
$img->penSize(3,3);
$img->angle(0);
$img->line(20); # 20 pixels going to the right
$img->turn(30); # set turning angle to 30 degrees
$img->line(20); # 20 pixel line
$img->line(20);
$img->line(20);
$img->turn(-90); # set turning angle to -90 degrees
$img->line(50); # 50 pixel line
# draw a cyan polygon edged in blue
my $poly = new GD::Polygon;
$poly->addPt(150,100);
$poly->addPt(199,199);
$poly->addPt(100,199);
$img->bgcolor('cyan');
$img->fgcolor('blue');
$img->penSize(1,1);
$img->polygon($poly);
# convert into png data
print $img->png;
=head1 DESCRIPTION
GD::Simple is a subclass of the GD library that shortens many of the
long GD method calls by storing information about the pen color, size
and position in the GD object itself. It also adds a small number of
"turtle graphics" style calls for those who prefer to work in polar
coordinates. In addition, the library allows you to use symbolic
names for colors, such as "chartreuse", and will manage the colors for
you.
=head2 The Pen
GD::Simple maintains a "pen" whose settings are used for line- and
shape-drawing operations. The pen has the following properties:
=over 4
=item fgcolor
The pen foreground color is the color of lines and the borders of
filled and unfilled shapes.
=item bgcolor
The pen background color is the color of the contents of filled
shapes.
=item pensize
The pen size is the width of the pen. Larger sizes draw thicker
lines.
=item position
The pen position is its current position on the canvas in (X,Y)
coordinates.
=item angle
When drawing in turtle mode, the pen angle determines the current
direction of lines of relative length.
=item turn
When drawing in turtle mode, the turn determines the clockwise or
counterclockwise angle that the pen will turn before drawing the next
line.
=item font
The font to use when drawing text. Both built-in bitmapped fonts and
TrueType fonts are supported.
=item fontsize
The size of the font to use when drawing with TrueType fonts.
=back
One sets the position and properties of the pen and then draws. As
the drawing progresses, the position of the pen is updated.
=head2 Methods
GD::Simple introduces a number of new methods, a few of which have the
same name as GD::Image methods, and hence change their behavior. In
addition to these new methods, GD::Simple objects support all of the
GD::Image methods. If you make a method call that isn't directly
supported by GD::Simple, it refers the request to the underlying
GD::Image object. Hence one can load a JPEG image into GD::Simple and
declare it to be TrueColor by using this call, which is effectively
inherited from GD::Image:
my $img = GD::Simple->newFromJpeg('./myimage.jpg',1);
The rest of this section describes GD::Simple-specific methods.
=cut
use strict;
use GD;
use GD::Group;
use Math::Trig;
use Carp 'croak';
our @ISA = 'Exporter';
our @EXPORT = @GD::EXPORT;
our @EXPORT_OK = @GD::EXPORT_OK;
our $AUTOLOAD;
my %COLORS;
my $IMAGECLASS = 'GD::Image';
my $TRANSPARENT;
sub AUTOLOAD {
my $self = shift;
my($pack,$func_name) = $AUTOLOAD=~/(.+)::([^:]+)$/;
return if $func_name eq 'DESTROY';
if (ref $self && exists $self->{gd}) {
$self->{gd}->$func_name(@_);
} else {
my @result = $IMAGECLASS->$func_name(@_);
if (UNIVERSAL::isa($result[0],'GD::Image')) {
return $self->new($result[0]);
} else {
return @result;
}
}
}
=over 4
=item $img = GD::Simple->new($x,$y [,$truecolor])
=item $img = GD::Simple->new($gd)
Create a new GD::Simple object. There are two forms of new(). In the
first form, pass the width and height of the desired canvas, and
optionally a boolean flag to request a truecolor image. In the second
form, pass a previously-created GD::Image object.
=cut
# dual-purpose code - beware
sub new {
my $pack = shift;
unshift @_,(100,100) if @_ == 0;
if (@_ >= 2) { # traditional GD::Image->new() call
my $gd = $IMAGECLASS->new(@_);
my $self = $pack->new($gd);
$self->clear;
return $self;
}
if (@_ == 1) { # initialize from existing image
my $gd = shift;
my $self = bless {
gd => $gd,
xy => [0,0],
font => gdSmallFont,
fontsize => 9,
turningangle => 0,
angle => 0,
pensize => 1,
},$pack;
$self->{bgcolor} = $self->translate_color(255,255,255);
$self->{fgcolor} = $self->translate_color(0,0,0);
return $self;
}
}
=item GD::Simple->class('GD');
=item GD::Simple->class('GD::SVG');
Select whether new() should use GD or GD::SVG internally. Call
GD::Simple->class('GD::SVG') before calling new() if you wish to
generate SVG images.
If future GD subclasses are created, this method will subport them.
=cut
sub class {
my $pack = shift;
if (@_) {
$IMAGECLASS = shift;
eval "require $IMAGECLASS; 1" or die $@;
$IMAGECLASS = "$IMAGECLASS\:\:Image"
if $IMAGECLASS eq 'GD::SVG';
}
$IMAGECLASS;
}
=item $img->moveTo($x,$y)
This call changes the position of the pen without drawing. It moves
the pen to position ($x,$y) on the drawing canvas.
=cut
sub moveTo {
my $self = shift;
croak 'Usage GD::Simple->moveTo($x,$y)' unless @_ == 2;
my ($x,$y) = @_;
$self->{xy} = [$x,$y];
}
=item $img->move($dx,$dy)
=item $img->move($dr)
This call changes the position of the pen without drawing. When called
with two arguments it moves the pen $dx pixels to the right and $dy
pixels downward. When called with one argument it moves the pen $dr
pixels along the vector described by the current pen angle.
=cut
sub move {
my $self = shift;
if (@_ == 1) { # polar coordinates -- this is r
$self->{angle} += $self->{turningangle};
my $angle = deg2rad($self->{angle});
$self->{xy}[0] += $_[0] * cos($angle);
$self->{xy}[1] += $_[0] * sin($angle);
}
elsif (@_ == 2) { # cartesian coordinates
$self->{xy}[0] += $_[0];
$self->{xy}[1] += $_[1];
} else {
croak 'Usage GD::Simple->move($dx,$dy) or move($r)';
}
}
=item $img->lineTo($x,$y)
The lineTo() call simultaneously draws and moves the pen. It draws a
line from the current pen position to the position defined by ($x,$y)
using the current pen size and color. After drawing, the position of
the pen is updated to the new position.
=cut
sub lineTo {
my $self = shift;
croak 'Usage GD::Simple->lineTo($x,$y)' unless @_ == 2;
$self->gd->line($self->curPos,@_,$self->fgcolor);
$self->moveTo(@_);
}
=item $img->line($x1,$y1,$x2,$y2 [,$color])
=item $img->line($dx,$dy)
=item $img->line($dr)
The line() call simultaneously draws and moves the pen. When called
with two arguments it draws a line from the current position of the
pen to the position $dx pixels to the right and $dy pixels down. When
called with one argument, it draws a line $dr pixels long along the
angle defined by the current pen angle.
When called with four or five arguments, line() behaves like
GD::Image->line().
=cut
sub line {
my $self = shift;
if (@_ >= 4) {
my ($x1,$x2,$y1,$y2,$color) = @_;
$color ||= $self->fgcolor;
return $self->gd->line($x1,$x2,$y1,$y2,$color);
}
croak 'Usage GD::Simple->line($dx,$dy) or line($r) or line($x1,$y1,$x2,$y2 [,$color])' unless @_ >= 1;
my @curPos = $self->curPos;
$self->move(@_);
my @newPos = $self->curPos;
return $self->gd->line(@curPos,@newPos,$self->fgcolor);
}
=item $img->clear
This method clears the canvas by painting over it with the current
background color.
=cut
sub clear {
my $self = shift;
$self->gd->filledRectangle(0,0,$self->getBounds,$self->bgcolor);
}
=item $img->rectangle($x1,$y1,$x2,$y2)
This method draws the rectangle defined by corners ($x1,$y1),
($x2,$y2). The rectangle's edges are drawn in the foreground color and
its contents are filled with the background color. To draw a solid
rectangle set bgcolor equal to fgcolor. To draw an unfilled rectangle
(transparent inside), set bgcolor to undef.
=cut
sub rectangle {
my $self = shift;
return $self->gd->rectangle(@_) if @_ == 5;
croak 'Usage GD::Simple->rectangle($x1,$y1,$x2,$y2)' unless @_ == 4;
my $gd = $self->gd;
my ($bg,$fg) = ($self->bgcolor,$self->fgcolor);
$gd->filledRectangle(@_,$bg) if defined $bg;
$gd->rectangle(@_,$fg) if defined $fg && (!defined $bg || $bg != $fg);
}
=item $img->ellipse($width,$height)
This method draws the ellipse centered at the current location with
width $width and height $height. The ellipse's border is drawn in the
foreground color and its contents are filled with the background
color. To draw a solid ellipse set bgcolor equal to fgcolor. To draw
an unfilled ellipse (transparent inside), set bgcolor to undef.
=cut
sub ellipse {
my $self = shift;
return $self->gd->ellipse(@_) if @_ == 5;
croak 'Usage GD::Simple->ellipse($width,$height)' unless @_ == 2;
my $gd = $self->gd;
my ($bg,$fg) = ($self->bgcolor,$self->fgcolor);
$gd->filledEllipse($self->curPos,@_,$bg) if defined $bg;
$gd->ellipse($self->curPos,@_,$fg) if defined $fg && (!defined $bg || $bg != $fg);
}
=item $img->arc($cx,$cy,$width,$height,$start,$end [,$style])
This method draws filled and unfilled arcs. See L<GD> for a
description of the arguments. To draw a solid arc (such as a pie
wedge) set bgcolor equal to fgcolor. To draw an unfilled arc, set
bgcolor to undef.
=cut
sub arc {
my $self = shift;
return $self->gd->arc(@_) if @_ == 7;
croak 'Usage GD::Simple->arc($width,$height,$start,$end,$style)' unless @_ >= 4;
my ($width,$height,$start,$end,$style) = @_;
my $gd = $self->gd;
my ($bg,$fg) = ($self->bgcolor,$self->fgcolor);
my ($cx,$cy) = $self->curPos;
if ($bg) {
my @args = ($cx,$cy,$width,$height,$start,$end,$bg);
push @args,$style if defined $style;
$gd->filledArc(@args);
} else {
my @args = ($cx,$cy,$width,$height,$start,$end,$fg);
$gd->arc(@args);
}
}
=item $img->polygon($poly)
This method draws filled and unfilled polygon using the current
settings of fgcolor for the polygon border and bgcolor for the polygon
fill color. See L<GD> for a description of creating polygons. To draw
a solid polygon set bgcolor equal to fgcolor. To draw an unfilled
polygon, set bgcolor to undef.
=cut
sub polygon {
my $self = shift;
croak 'Usage GD::Simple->polygon($poly)' unless @_ == 1;
my $gd = $self->gd;
my ($bg,$fg) = ($self->bgcolor,$self->fgcolor);
$gd->filledPolygon(@_,$bg) if defined $bg;
$gd->openPolygon(@_,$fg) if defined $fg && (!defined $bg || $bg != $fg);
}
=item $img->polyline($poly)
This method draws polygons without closing the first and last vertices
(similar to GD::Image->unclosedPolygon()). It uses the fgcolor to draw
the line.
=cut
sub polyline {
my $self = shift;
croak 'Usage GD::Simple->polyline($poly)' unless @_ == 1;
my $gd = $self->gd;
my $fg = $self->fgcolor;
$gd->unclosedPolygon(@_,$fg);
}
=item $img->string($string)
This method draws the indicated string starting at the current
position of the pen. The pen is moved to the end of the drawn string.
Depending on the font selected with the font() method, this will use
either a bitmapped GD font or a TrueType font. The angle of the pen
will be consulted when drawing the text. For TrueType fonts, any angle
is accepted. For GD bitmapped fonts, the angle can be either 0 (draw
horizontal) or -90 (draw upwards).
For consistency between the TrueType and GD font behavior, the string
is always drawn so that the current position of the pen corresponds to
the bottom left of the first character of the text. This is different
from the GD behavior, in which the first character of bitmapped fonts
hangs down from the pen point.
This method returns a polygon indicating the bounding box of the
rendered text. If an error occurred (such as invalid font
specification) it returns undef and an error message in $@.
=cut
sub string {
my $self = shift;
return $self->gd->string(@_) if @_ == 5;
my $string = shift;
my $font = $self->font;
my @bounds;
if (ref $font && $font->isa('GD::Font')) {
my ($x,$y) = $self->curPos;
if ($self->angle == -90) {
$x -= $font->height;
$y -= $font->width;
$self->gd->stringUp($font,$x,$y,$string,$self->fgcolor);
$self->{xy}[1] -= length($string) * $font->width;
@bounds = ( ($self->{xy}[0],$y), ($x,$y), ($x,$self->{xy}[1]-$font->width), ($self->{xy}[0],$self->{xy}[1]-$font->width) );
} else {
$y -= $font->height;
$self->gd->string($font,$x,$y,$string,$self->fgcolor);
$self->{xy}[0] += length($string) * $font->width;
@bounds = ( ($x,$self->{xy}[1]), ($self->{xy}[0],$self->{xy}[1]), ($self->{xy}[0],$y), ($x,$y) );
}
}
else {
$self->useFontConfig(1);
@bounds = $self->stringFT($self->fgcolor,$font,
$self->fontsize,-deg2rad($self->angle), # -pi * $self->angle/180,
$self->curPos,$string);
return unless @bounds;
my ($delta_x,$delta_y) = $self->_string_width(@bounds);
$self->{xy}[0] += $delta_x;
$self->{xy}[1] += $delta_y;
}
my $poly = GD::Polygon->new;
while (@bounds) {
$poly->addPt(splice(@bounds,0,2));
}
return $poly;
}
=item $metrics = $img->fontMetrics
=item ($metrics,$width,$height) = GD::Simple->fontMetrics($font,$fontsize,$string)
This method returns information about the current font, most commonly
a TrueType font. It can be invoked as an instance method (on a
previously-created GD::Simple object) or as a class method (on the
'GD::Simple' class).
When called as an instance method, fontMetrics() takes no arguments
and returns a single hash reference containing the metrics that
describe the currently selected font and size. The hash reference
contains the following information:
xheight the base height of the font from the bottom to the top of
a lowercase 'm'
ascent the length of the upper stem of the lowercase 'd'
descent the length of the lower step of the lowercase 'j'
lineheight the distance from the bottom of the 'j' to the top of
the 'd'
leading the distance between two adjacent lines
=cut
# return %$fontmetrics
# keys: 'ascent', 'descent', 'lineheight', 'xheight', 'leading'
sub fontMetrics {
my $self = shift;
unless (ref $self) { #class invocation -- create a scratch
$self = $self->new;
$self->font(shift) if defined $_[0];
$self->fontsize(shift) if defined $_[0];
}
my $font = $self->font;
my $metrics;
if (ref $font && $font->isa('GD::Font')) {
my $height = $font->height;
$metrics = {ascent => 0,
descent => 0,
lineheight => $height,
xheight => $height,
leading => 0};
}
else {
$self->useFontConfig(1);
my @mbounds = GD::Image->stringFT($self->fgcolor,$font,
$self->fontsize,0,
0,0,'m');
my $xheight = $mbounds[3]-$mbounds[5];
my @jbounds = GD::Image->stringFT($self->fgcolor,$font,
$self->fontsize,0,
0,0,'j');
my $ascent = $mbounds[7]-$jbounds[7];
my $descent = $jbounds[3]-$mbounds[3];
my @mmbounds = GD::Image->stringFT($self->fgcolor,$font,
$self->fontsize,0,
0,0,"m\nm");
my $twolines = $mmbounds[3]-$mmbounds[5];
my $lineheight = $twolines - 2*$xheight;
my $leading = $lineheight - $ascent - $descent;
$metrics = {ascent => $ascent,
descent => $descent,
lineheight => $lineheight,
xheight => $xheight,
leading => $leading};
}
if ((my $string = shift) && wantarray) {
my ($width,$height) = $self->stringBounds($string);
return ($metrics,abs($width),abs($height));
}
return $metrics;
}
=item ($delta_x,$delta_y)= $img->stringBounds($string)
This method indicates the X and Y offsets (which may be negative) that
will occur when the given string is drawn using the current font,
fontsize and angle. When the string is drawn horizontally, it gives
the width and height of the string's bounding box.
=cut
sub stringBounds {
my $self = shift;
my $string = shift;
my $font = $self->font;
if (ref $font && $font->isa('GD::Font')) {
if ($self->angle == -90) {
return ($font->height,-length($string) * $font->width);
} else {
return (length($string) * $font->width,$font->height);
}
}
else {
$self->useFontConfig(1);
my @bounds = GD::Image->stringFT($self->fgcolor,$font,
$self->fontsize,-deg2rad($self->angle),
$self->curPos,$string);
return $self->_string_width(@bounds);
}
}
=item $delta_x = $img->stringWidth($string)
This method indicates the width of the string given the current font,
fontsize and angle. It is the same as ($img->stringBounds($string))[0]
=cut
sub stringWidth {
return ((shift->stringBounds(@_))[0]);
}
sub _string_width {
my $self = shift;
my @bounds = @_;
my $delta_x = abs($bounds[2]-$bounds[0]);
my $delta_y = abs($bounds[5]-$bounds[3]);
my $angle = $self->angle % 360;
if ($angle >= 0 && $angle < 90) {
return ($delta_x,$delta_y);
} elsif ($angle >= 90 && $angle < 180) {
return (-$delta_x,$delta_y);
} elsif ($angle >= 180 && $angle < 270) {
return (-$delta_x,-$delta_y);
} elsif ($angle >= 270 && $angle < 360) {
return ($delta_x,-$delta_y);
}
}
=item ($x,$y) = $img->curPos
Return the current position of the pen. Set the current position
using moveTo().
=cut
sub curPos { @{shift->{xy}}; }
=item $font = $img->font([$newfont] [,$newsize])
Get or set the current font. Fonts can be GD::Font objects, TrueType
font file paths, or fontconfig font patterns like "Times:italic" (see
L<fontconfig>). The latter feature requires that you have the
fontconfig library installed and are using libgd version 2.0.33 or
higher.
As a shortcut, you may pass two arguments to set the font and the
fontsize simultaneously. The fontsize is only valid when drawing with
TrueType fonts.
=cut
sub font {
my $self = shift;
$self->{font} = shift if @_;
$self->{fontsize} = shift if @_;
$self->{font};
}
=item $size = $img->fontsize([$newfontsize])
Get or set the current font size. This is only valid for TrueType
fonts.
=cut
sub fontsize {
my $self = shift;
$self->{fontsize} = shift if @_;
$self->{fontsize};
}
=item $size = $img->penSize([$newpensize])
Get or set the current pen width for use during line drawing
operations.
=cut
sub penSize {
my $self = shift;
if (@_) {
$self->{pensize} = shift;
$self->gd->setThickness($self->{pensize});
}
$self->{pensize};
}
=item $angle = $img->angle([$newangle])
Set the current angle for use when calling line() or move() with a
single argument.
Here is an example of using turn() and angle() together to draw an
octagon. The first line drawn is the downward-slanting top right
edge. The last line drawn is the horizontal top of the octagon.
$img->moveTo(200,50);
$img->angle(0);
$img->turn(360/8);
for (1..8) { $img->line(50) }
=cut
sub angle {
my $self = shift;
$self->{angle} = shift if @_;
$self->{angle};
}
=item $angle = $img->turn([$newangle])
Get or set the current angle to turn prior to drawing lines. This
value is only used when calling line() or move() with a single
argument. The turning angle will be applied to each call to line() or
move() just before the actual drawing occurs.
Angles are in degrees. Positive values turn the angle clockwise.
=cut
# degrees, not radians
sub turn {
my $self = shift;
$self->{turningangle} = shift if @_;
$self->{turningangle};
}
=item $color = $img->fgcolor([$newcolor])
Get or set the pen's foreground color. The current pen color can be
set by (1) using an (r,g,b) triple; (2) using a previously-allocated
color from the GD palette; or (3) by using a symbolic color name such
as "chartreuse." The list of color names can be obtained using
color_names(). The special color name 'transparent' will create a
completely transparent color.
=cut
sub fgcolor {
my $self = shift;
$self->{fgcolor} = $self->translate_color(@_) if @_;
$self->{fgcolor};
}
=item $color = $img->bgcolor([$newcolor])
Get or set the pen's background color. The current pen color can be
set by (1) using an (r,g,b) triple; (2) using a previously-allocated
color from the GD palette; or (3) by using a symbolic color name such
as "chartreuse." The list of color names can be obtained using
color_names(). The special color name 'transparent' will create a
completely transparent color.
=cut
sub bgcolor {
my $self = shift;
$self->{bgcolor} = $self->translate_color(@_) if @_;
$self->{bgcolor};
}
=item $index = $img->translate_color(@args)
Translates a color into a GD palette or TrueColor index. You may pass
either an (r,g,b) triple or a symbolic color name. If you pass a
previously-allocated index, the method will return it unchanged.
=cut
sub translate_color {
my $self = shift;
return unless defined $_[0];
my ($r,$g,$b);
if (@_ == 1 && $_[0] =~ /^-?\d+/) { # previously allocated index
return $_[0];
}
elsif (@_ == 3) { # (rgb triplet)
($r,$g,$b) = @_;
}
elsif (lc $_[0] eq 'transparent') {
return $TRANSPARENT ||= $self->alphaColor('white',127);
}
else {
$self->read_color_table unless %COLORS;
die "unknown color" unless exists $COLORS{lc $_[0]};
($r,$g,$b) = @{$COLORS{lc $_[0]}};
}
return $self->colorResolve($r,$g,$b);
}
sub transparent {
my $self = shift;
my $index = $self->translate_color(@_);
$self->gd->transparent($index);
}
=item $index = $img->alphaColor(@args,$alpha)
Creates an alpha color. You may pass either an (r,g,b) triple or a
symbolic color name, followed by an integer indicating its
opacity. The opacity value ranges from 0 (fully opaque) to 127 (fully
transparent).
=cut
sub alphaColor {
my $self = shift;
return unless defined $_[0];
my ($r,$g,$b,$a);
if (@_ == 4) { # (rgb triplet)
($r,$g,$b,$a) = @_;
} else {
$self->read_color_table unless %COLORS;
die "unknown color" unless exists $COLORS{lc $_[0]};
($r,$g,$b) = @{$COLORS{lc $_[0]}};
$a = $_[1];
}
return $self->colorAllocateAlpha($r,$g,$b,$a);
}
=item @names = GD::Simple->color_names
=item $translate_table = GD::Simple->color_names
Called in a list context, color_names() returns the list of symbolic
color names recognized by this module. Called in a scalar context,
the method returns a hash reference in which the keys are the color
names and the values are array references containing [r,g,b] triples.
=cut
sub color_names {
my $self = shift;
$self->read_color_table unless %COLORS;
return wantarray ? sort keys %COLORS : \%COLORS;
}
=item $gd = $img->gd
Return the internal GD::Image object. Usually you will not need to
call this since all GD methods are automatically referred to this object.
=cut
sub gd { shift->{gd} }
sub read_color_table {
my $class = shift;
while (<DATA>) {
chomp;
last if /^__END__/;
my ($name,$r,$g,$b) = split /\s+/;
$COLORS{$name} = [hex $r,hex $g,hex $b];
}
}
sub setBrush {
my $self = shift;
my $brush = shift;
if ($brush->isa('GD::Simple')) {
$self->gd->setBrush($brush->gd);
} else {
$self->gd->setBrush($brush);
}
}
=item ($red,$green,$blue) = GD::Simple->HSVtoRGB($hue,$saturation,$value)
Convert a Hue/Saturation/Value (HSV) color into an RGB triple. The
hue, saturation and value are integers from 0 to 255.
=cut
sub HSVtoRGB {
my $self = shift;
@_ == 3 or croak "Usage: GD::Simple->HSVtoRGB(\$hue,\$saturation,\$value)";
my ($h,$s,$v)=@_;
my ($r,$g,$b,$i,$f,$p,$q,$t);
if( $s == 0 ) {
## achromatic (grey)
return ($v,$v,$v);
}
$h %= 255;
$s /= 255; ## scale saturation from 0.0-1.0
$h /= 255; ## scale hue from 0 to 1.0
$h *= 360; ## and now scale it to 0 to 360
$h /= 60; ## sector 0 to 5
$i = $h % 6;
$f = $h - $i; ## factorial part of h
$p = $v * ( 1 - $s );
$q = $v * ( 1 - $s * $f );
$t = $v * ( 1 - $s * ( 1 - $f ) );
if($i<1) {
$r = $v;
$g = $t;
$b = $p;
} elsif($i<2){
$r = $q;
$g = $v;
$b = $p;
} elsif($i<3){
$r = $p;
$g = $v;
$b = $t;
} elsif($i<4){
$r = $p;
$g = $q;
$b = $v;
} elsif($i<5){
$r = $t;
$g = $p;
$b = $v;
} else {
$r = $v;
$g = $p;
$b = $q;
}
return (int($r+0.5),int($g+0.5),int($b+0.5));
}
=item ($hue,$saturation,$value) = GD::Simple->RGBtoHSV($hue,$saturation,$value)
Convert a Red/Green/Blue (RGB) value into a Hue/Saturation/Value (HSV)
triple. The hue, saturation and value are integers from 0 to 255.
=back
=cut
sub RGBtoHSV {
my $self = shift;
my ($r, $g ,$bl) = @_;
my ($min,undef,$max) = sort {$a<=>$b} ($r,$g,$bl);
return (0,0,0) unless $max > 0;
my $v = $max;
my $s = 255 * ($max - $min)/$max;
my $h;
my $range = $max - $min;
if ($range == 0) { # all colors are equal, so monochrome
return (0,0,$max);
}
if ($max == $r) {
$h = 60 * ($g-$bl)/$range;
}
elsif ($max == $g) {
$h = 60 * ($bl-$r)/$range + 120;
}
else {
$h = 60 * ($r-$g)/$range + 240;
}
$h = int($h*255/360 + 0.5);
return ($h, $s, $v);
}
sub newGroup {
my $self = shift;
return $self->GD::newGroup(@_);
}
1;
__DATA__
white FF FF FF
black 00 00 00
aliceblue F0 F8 FF
antiquewhite FA EB D7
aqua 00 FF FF
aquamarine 7F FF D4
azure F0 FF FF
beige F5 F5 DC
bisque FF E4 C4
blanchedalmond FF EB CD
blue 00 00 FF
blueviolet 8A 2B E2
brown A5 2A 2A
burlywood DE B8 87
cadetblue 5F 9E A0
chartreuse 7F FF 00
chocolate D2 69 1E
coral FF 7F 50
cornflowerblue 64 95 ED
cornsilk FF F8 DC
crimson DC 14 3C
cyan 00 FF FF
darkblue 00 00 8B
darkcyan 00 8B 8B
darkgoldenrod B8 86 0B
darkgray A9 A9 A9
darkgreen 00 64 00
darkkhaki BD B7 6B
darkmagenta 8B 00 8B
darkolivegreen 55 6B 2F
darkorange FF 8C 00
darkorchid 99 32 CC
darkred 8B 00 00
darksalmon E9 96 7A
darkseagreen 8F BC 8F
darkslateblue 48 3D 8B
darkslategray 2F 4F 4F
darkturquoise 00 CE D1
darkviolet 94 00 D3
deeppink FF 14 100
deepskyblue 00 BF FF
dimgray 69 69 69
dodgerblue 1E 90 FF
firebrick B2 22 22
floralwhite FF FA F0
forestgreen 22 8B 22
fuchsia FF 00 FF
gainsboro DC DC DC
ghostwhite F8 F8 FF
gold FF D7 00
goldenrod DA A5 20
gray 80 80 80
green 00 80 00
greenyellow AD FF 2F
honeydew F0 FF F0
hotpink FF 69 B4
indianred CD 5C 5C
indigo 4B 00 82
ivory FF FF F0
khaki F0 E6 8C
lavender E6 E6 FA
lavenderblush FF F0 F5
lawngreen 7C FC 00
lemonchiffon FF FA CD
lightblue AD D8 E6
lightcoral F0 80 80
lightcyan E0 FF FF
lightgoldenrodyellow FA FA D2
lightgreen 90 EE 90
lightgrey D3 D3 D3
lightpink FF B6 C1
lightsalmon FF A0 7A
lightseagreen 20 B2 AA
lightskyblue 87 CE FA
lightslategray 77 88 99
lightsteelblue B0 C4 DE
lightyellow FF FF E0
lime 00 FF 00
limegreen 32 CD 32
linen FA F0 E6
magenta FF 00 FF
maroon 80 00 00
mediumaquamarine 66 CD AA
mediumblue 00 00 CD
mediumorchid BA 55 D3
mediumpurple 100 70 DB
mediumseagreen 3C B3 71
mediumslateblue 7B 68 EE
mediumspringgreen 00 FA 9A
mediumturquoise 48 D1 CC
mediumvioletred C7 15 85
midnightblue 19 19 70
mintcream F5 FF FA
mistyrose FF E4 E1
moccasin FF E4 B5
navajowhite FF DE AD
navy 00 00 80
oldlace FD F5 E6
olive 80 80 00
olivedrab 6B 8E 23
orange FF A5 00
orangered FF 45 00
orchid DA 70 D6
palegoldenrod EE E8 AA
palegreen 98 FB 98
paleturquoise AF EE EE
palevioletred DB 70 100
papayawhip FF EF D5
peachpuff FF DA B9
peru CD 85 3F
pink FF C0 CB
plum DD A0 DD
powderblue B0 E0 E6
purple 80 00 80
red FF 00 00
rosybrown BC 8F 8F
royalblue 41 69 E1
saddlebrown 8B 45 13
salmon FA 80 72
sandybrown F4 A4 60
seagreen 2E 8B 57
seashell FF F5 EE
sienna A0 52 2D
silver C0 C0 C0
skyblue 87 CE EB
slateblue 6A 5A CD
slategray 70 80 90
snow FF FA FA
springgreen 00 FF 7F
steelblue 46 82 B4
tan D2 B4 8C
teal 00 80 80
thistle D8 BF D8
tomato FF 63 47
turquoise 40 E0 D0
violet EE 82 EE
wheat F5 DE B3
whitesmoke F5 F5 F5
yellow FF FF 00
yellowgreen 9A CD 32
gradient1 00 ff 00
gradient2 0a ff 00
gradient3 14 ff 00
gradient4 1e ff 00
gradient5 28 ff 00
gradient6 32 ff 00
gradient7 3d ff 00
gradient8 47 ff 00
gradient9 51 ff 00
gradient10 5b ff 00
gradient11 65 ff 00
gradient12 70 ff 00
gradient13 7a ff 00
gradient14 84 ff 00
gradient15 8e ff 00
gradient16 99 ff 00
gradient17 a3 ff 00
gradient18 ad ff 00
gradient19 b7 ff 00
gradient20 c1 ff 00
gradient21 cc ff 00
gradient22 d6 ff 00
gradient23 e0 ff 00
gradient24 ea ff 00
gradient25 f4 ff 00
gradient26 ff ff 00
gradient27 ff f4 00
gradient28 ff ea 00
gradient29 ff e0 00
gradient30 ff d6 00
gradient31 ff cc 00
gradient32 ff c1 00
gradient33 ff b7 00
gradient34 ff ad 00
gradient35 ff a3 00
gradient36 ff 99 00
gradient37 ff 8e 00
gradient38 ff 84 00
gradient39 ff 7a 00
gradient40 ff 70 00
gradient41 ff 65 00
gradient42 ff 5b 00
gradient43 ff 51 00
gradient44 ff 47 00
gradient45 ff 3d 00
gradient46 ff 32 00
gradient47 ff 28 00
gradient48 ff 1e 00
gradient49 ff 14 00
gradient50 ff 0a 00
__END__
=head1 COLORS
This script will create an image showing all the symbolic colors.
#!/usr/bin/perl
use strict;
use GD::Simple;
my @color_names = GD::Simple->color_names;
my $cols = int(sqrt(@color_names));
my $rows = int(@color_names/$cols)+1;
my $cell_width = 100;
my $cell_height = 50;
my $legend_height = 16;
my $width = $cols * $cell_width;
my $height = $rows * $cell_height;
my $img = GD::Simple->new($width,$height);
$img->font(gdSmallFont);
for (my $c=0; $c<$cols; $c++) {
for (my $r=0; $r<$rows; $r++) {
my $color = $color_names[$c*$rows + $r] or next;
my @topleft = ($c*$cell_width,$r*$cell_height);
my @botright = ($topleft[0]+$cell_width,$topleft[1]+$cell_height-$legend_height);
$img->bgcolor($color);
$img->fgcolor($color);
$img->rectangle(@topleft,@botright);
$img->moveTo($topleft[0]+2,$botright[1]+$legend_height-2);
$img->fgcolor('black');
$img->string($color);
}
}
print $img->png;
=head1 AUTHOR
The GD::Simple module is copyright 2004, Lincoln D. Stein. It is
distributed under the same terms as Perl itself. See the "Artistic
License" in the Perl source code distribution for licensing terms.
The latest versions of GD.pm are available at https://github.com/lstein/Perl-GD
=head1 SEE ALSO
L<GD>,
L<GD::Polyline>,
L<GD::SVG>,
L<Image::Magick>
=cut